Table 7
Sensitivity, specificity, and positive and negative predictive values for parent-reported and corrected body mass index categories, subsample B, household population aged 6 to 11, Canada, 2007 to 2009

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  International Obesity Task Force BMI cut-points World Health Organization BMI cut-points
Parent-reported Corrected Parent-reported Corrected
% 95% confidence interval % 95% confidence interval % 95% confidence interval % 95% confidence interval
from to from to from to from to
Sensitivity (% true positives)
Normal weight 83.0 76.0 88.3 87.1* 79.9 91.9 79.4 70.7 86.0 86.1* 76.8 92.1
Overweight 59.4 46.4 71.2 60.0 48.4 70.5 38.7 26.9 52.0 37.6 22.0 56.4
Obese 57.2 32.5 78.8 52.7 27.2 76.9 62.6 42.3 79.3 69.5 52.9 82.3
Specificity (% true negatives)
Normal weight 77.7 61.7 88.3 75.7 61.0 86.1 72.0 59.0 82.1 68.8 55.0 79.9
Overweight 90.1 84.4 93.9 89.1 83.2 93.1 85.6 79.7 90.0 87.4 79.8 92.3
Obese 90.0 82.7 94.5 94.5* 88.7 97.4 87.4 80.7 92.0 92.9* 87.3 96.2
Positive predictive value
Normal weight 92.0 84.3 96.1 91.7 84.5 95.7 82.6 75.0 88.3 82.2 73.5 88.6
Overweight 58.9 47.8 69.2 56.7 42.4 70.0 44.5 30.9 59.0 47.1 28.3 66.8
Obese 24.0 13.4 39.2 34.6 13.2 64.7 45.3 30.1 61.5 62.2* 44.3 77.4
Negative predictive value
Normal weight 59.7 50.9 67.9 65.4 52.2 76.6 67.6 59.9 74.4 74.7* 63.4 83.5
Overweight 90.3 83.7 94.4 90.3 84.1 94.3 82.4 74.8 88.0 82.4 73.4 88.8
Obese 97.5 93.5 99.0 97.3 93.4 98.9 93.3 88.1 96.3 94.8 90.9 97.1
* significantly different from self-reported estimate (p < 0.05)
Source: 2007 to 2009 Canadian Health Measures Survey.